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http://dx.doi.org/10.4150/KPMI.2015.22.3.181

Investigation for Microstructure and Hardness of Welded Zone of Cu-Ni Alloy using W92-Ni-Fe Sintering Tool  

Yoon, Tae-Jin (National Core Research Center for Hybrid Materials Solution, Pusan National University)
Park, Sang-Won (Pusan National Univ., Graduate School of Convergence Science)
Kang, Myung-Chang (Pusan National Univ., Graduate School of Convergence Science)
Noh, Joong-Suk (R&D Center, Taekwang Tech Co., LTD.)
Chung, Sung-Wook (Welding Engineering R&D group, Daewoo Shipbuilding and Marine Engineering Co., Ltd.)
Kang, Chung-Yun (National Core Research Center for Hybrid Materials Solution, Pusan National University)
Publication Information
Journal of Powder Materials / v.22, no.3, 2015 , pp. 181-186 More about this Journal
Abstract
In this study, the effect of the friction stir welding (FSW) was compared with that of the gas tungsten arc welding (GTAW) on the microstructure and microhardness of Cu-Ni alloy weldment. The weldment of 10 mm thickness was fabricated by FSW and GTAW, respectively. Both weldments were compared with each other by optical microstructure, microhardness test and grain size measurement. Results of this study suggest that the microhardness decreased from the base metal (BM) to the heat affected zone (HAZ) and increased at fusion zone (FZ) of GTAW and stir zone (SZ) of FSW. the minimum Hv value of both weldment was obtained at HAZ, respectively, which represents the softening zone, whereas Hv value of FSW weldment was little higher than that of GTAW weldment. These phenomena can be explained by the grain size difference between HAZs of each weldment. Grain size was increased at the HAZ during FSW and GTAW. Because FSW is a solid-state joining process obtaining the lower heat-input generated by rotating shoulder than heat generated in the arc of GTAW.
Keywords
Friction stir welding; Gas tungsten arc welding; Cu-Ni alloy; Microstructure; Micro hardness;
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